package API.DAY1;

public class ToUpperCaseDemo {//切换大小写
    public static void main(String[] args) {
        String x = "我爱Java";
//        String up = x.toUpperCase();
//        System.out.println(up);
        System.out.println(x.toUpperCase());
        System.out.println(x.toLowerCase());
//        String low = x.toLowerCase();
//        System.out.println(low);
    }
}
